JPH06216852A - Optical module - Google Patents

Abstract

(57) [Abstract] [Object] To provide an optical module that electrically insulates an image signal generator and a signal receiver and transmits an analog image signal, is small in size, and has excellent transmission characteristics. [Structure] A light emitting element 5 and a light receiving element 7 electrically connected to the E / O conversion section A and the O / E conversion section B are arranged so as to face each other and insulated and fixed by a receptacle 6, and the receptacle 6 and the E / O conversion are The part A and the O / E conversion part B are electrically insulated from each other and integrated on the same circuit board 12 to form the board 12
Is stored in the metal case 13, and the metal case 13
The E / O converter A and the O / E converter B are electrically connected to the analog image signal input terminal 1 and the output terminal 10 and the metal case 13 from the outside of the E / O converter A and O, respectively. The E / O converters A and O / are provided to supply power to the / E converters B, which are electrically insulated from each other.
Power supply connector 1 electrically connected to each E conversion unit B
1 is provided to configure an optical module.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computerized tomography apparatus (Computerized Tomograph) which is an image signal generator.
y: hereinafter referred to as CT) and the like, and an optical module that electrically insulates a diagnostic device such as a laser imager, which serves as a signal receiver, and transmits an analog image signal generated by the diagnostic device to the imaging device. Is.

[0002]

2. Description of the Related Art Conventionally, a diagnostic device which is an image signal generator is electrically insulated from a printing device of a signal receiver arranged at a relatively short distance, and an analog image signal is transmitted from the diagnostic device to the printing device. I was going to LED
A method using a photo coupler and a coaxial cable in which a photodiode and a photodiode are combined in an IC type to operate digitally. On the transmission side of the image signal, the electric signal is converted into an optical signal by the E / O converter, and the optical signal is transmitted to the O / E converter arranged on the reception side of the image signal by the optical fiber cable to convert the optical signal. A digital and analog optical communication system that uses an O / E converter to convert and demodulate electrical signals.
A method of electrically insulating and transmitting analog image signals using a high-frequency transformer. And so on.

[0003]

When an analog image signal is transmitted by electrically insulating the image signal generator and the signal receiver by each of the above-mentioned methods, each method has the following drawbacks. It was First, in the method using the photocoupler, high-speed transmission is difficult because the photocoupler operates digitally on and off. In addition, in the optical communication system, the optical fiber cable and the optical connector used for the transmission of the analog image signal are expensive and costly, the handling of the optical fiber cable is difficult, and the attenuated signal is amplified. However, there was a problem that the S / N ratio of the signal deteriorated. In addition, the method using the high frequency transformer has a drawback that the analog image signal is distorted because it is different from the AC signal.

The present invention solves these problems and is easy to handle.
An inexpensive optical module is provided.

[0005]

An optical module comprising an E / O conversion unit for transmitting an analog image signal and an O / E conversion unit, wherein each of the E / O conversion unit and the O / E conversion unit is electrically operated. The light emitting element and the light receiving element, which are electrically connected to each other, are arranged so as to face each other, and are insulated and fixed by a receptacle, and the receptacle and the E / O are connected.
The conversion unit and the O / E conversion unit are electrically insulated from each other and integrated on the same circuit board to house the substrate in a metal case, and the E / O conversion unit and the O / E conversion unit are housed in the metal case.
An analog image signal input terminal and an output terminal electrically connected to each of the E conversion units, and a power supply electrically insulated from each other to the E / O conversion unit and the O / E conversion unit from the outside of the metal case. The E / O converter and O / E
An optical module is configured by arranging a power supply connector electrically connected to each conversion unit.

[0006]

Since the light emitting element and the light receiving element are arranged opposite to each other and insulated and fixed by the receptacle, the S / N ratio of the signal is improved. In addition, the E / O converter and the O / E converter are insulated and integrated on the same circuit board, an optical fiber cable and an optical connector are not required, and a compact and inexpensive optical module can be obtained.
In addition, high speed transmission is possible by an analog optical communication system.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of the optical module of the present invention.
The optical module of the present invention comprises a BNC connector 1 of an analog image signal input terminal for inputting an analog image signal of an electric signal transmitted from a diagnostic device such as CT by a coaxial cable, and a terminating resistor 2 having one end connected to the BNC connector 1. ,
An amplifier 3 for amplifying an input signal, a drive circuit 4 for brightness-modulating a light emitting element based on an analog image signal of an amplified electric signal, a light emitting element 5 (a terminating resistor 2, an amplifier 3, a drive circuit 4, and a light emitting element 5). Of the light receiving element 7 and the light receiving element 7, which are arranged opposite to the light emitting element 5 and are insulated and fixed by the receptacle 6 also for optical axis alignment and receive the optical signal from the light emitting element 5. An amplifier 8 for amplifying the electric signal to be output, a driver circuit 9 for outputting the electric signal amplified by the amplifier 8 from the BNC connector 10 of the analog image signal output terminal (the light receiving element 7, the amplifier 8 and the driver circuit 9 are provided with O / E conversion unit B is configured), and an electric power is supplied to the E / O conversion unit and the O / E conversion unit for supplying power that is electrically insulated from the outside. Connectors 11, E / O conversion unit A and O
/ E converter B and receptacle 6 are electrically insulated from each other to form a circuit board 12, a metal case housing the insulated and integrated circuit board 12 and arranging BNC connectors 1 and 10 and a power connector 11. 13 and 13.

The optical module configured as described above includes
The analog image signal of the electric signal from the diagnostic device such as CT is connected to the BNC of the analog image signal input terminal by the coaxial cable.
Input to connector 1. The input analog image signal is amplified by the amplifier 3 through the terminating resistor 2, and the amplifier 3
The output of the light source 2 is subjected to brightness modulation of the light emitting element 5 via the drive circuit 4.

Then, an optical signal, which is electrically insulated from the E / O conversion section side and whose brightness is modulated, is incident on the light receiving element 7 arranged opposite to the light emitting element 5 on the O / E conversion section side, and the light receiving element is received. It is again extracted as an electric signal by 7. This electric signal is amplified by the amplifier 8 and transmitted by the driver circuit 9 from the BNC connector 10 of the analog image signal output terminal to the laser imager of the printing apparatus.

It goes without saying that a coaxial cable with a connector for transmitting an output signal may be attached to the BNC connector 10.

FIG. 2 is a block diagram showing another embodiment of the present invention, in which the optical modules 40, 50, 60 of the present invention switch a signal to thereby diagnose a plurality of CTs 21 and the like.
It can be connected to the image forming apparatus 22 and 23, and is attached to the image printing apparatus 14 including the image signal processing apparatus 15 for processing an image signal. Then, each optical module 40, 50, 60 corresponds to the plurality of CT devices 21, 22, 23, and the coaxial cable 1
A, 2A and 3A are connected and used.

FIG. 3 is a block diagram showing another embodiment of the present invention. In the optical modules 40, 50 and 60 of the present invention, a plurality of CT devices 21, 22, 23 are selected by switching signals.
A printing device 14 for processing an image signal, which includes an image signal processing device 15 that can be connected to a coaxial cable 1
It is connected by A, 2A, and 3A. The optical modules 40, 50, 60 according to the present invention include a plurality of CT devices 21, 2.
It is attached corresponding to each of 2, 23.

FIG. 4 is a block diagram showing still another embodiment of the present invention. By arranging the level converters 16 and 16 before and after the optical module 40 of the present invention, a high speed digital signal of ECL or TTL level is provided. It is possible to electrically insulate.

[0014]

Since the optical module of the present invention does not require an optical fiber cable or an optical connector, it is easier to handle as compared with the conventional optical communication system, an inexpensive optical module can be obtained, and the size is reduced to reduce the wiring space. The obtained optical module is obtained. Further, since the light emitting element and the light receiving element are arranged so as to face each other and are insulated and fixed, the transmission characteristics such as the signal S / N ratio are significantly improved. It has the effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention.

FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input terminal 2 Termination resistance 3,8 Amplifier 4 Drive circuit 5 Light emitting element 6 Receptacle 7 Light receiving element 9 Driver circuit 10 Output terminal 11 Power supply connector 12 Circuit board 13 Metal case 14 Printing device 15 Signal processing device 16 Level conversion circuit 21,22 , 23,24 CT equipment 40,50,60 Optical module 1A, 2A, 3A Coaxial cable

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment according to the present invention.

FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of another embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of still another embodiment of the present invention.

[Explanation of symbols] 1 input terminal 2 terminating resistor 3, 8 amplifier 4 drive circuit 5 light emitting element 6 receptacle 7 light receiving element 9 driver circuit 10 output terminal 11 power connector 12 circuit board 13 metal case 14 printing device 15 signal processing device 16 level Conversion circuit 21,22,23,24 CT device 40,50,60 Optical module 1A, 2A, 3A Coaxial cable

Claims (1)

[Claims] 1. An optical module comprising an E / O conversion unit for transmitting an analog image signal and an O / E conversion unit,
The light-emitting element and the light-receiving element electrically connected to the E / O conversion section and the O / E conversion section are arranged to face each other, and are insulated and fixed by a receptacle, and the receptacle, the E / O conversion section, and the O / E conversion section are connected to each other. Analogs electrically insulated from each other and integrated on the same circuit board to house the boards in a metal case, and the metal case is electrically connected to the E / O converter and the O / E converter, respectively. The E / O converter and the O / E converter for supplying powers electrically insulated from each other to the E / O converter and the O / E converter from the input terminal and the output terminal of the image signal and the outside of the metal case. An optical module, characterized in that a power connector electrically connected to each part is provided.